Slenderness ratio l of a vertical stiffener in a plate girder may be taken as
- A0.5 L/r
- B0.7 L/rCorrect
- C0.75 L/r
- DL/r
Solution
Concept
Effective length of a stiffener
Step-by-step solution
1. IS 800: effective length of a vertical stiffener for buckling check = 0.7 d (for stiffeners with both ends restrained).
Explanation
Stiffeners are not perfectly fixed or pinned, so a factor of 0.7 is taken.
Why the other options are wrong
0.5 and 0.75 are not the factors used.
Shortcut
0.7 d.
Common mistake
Using the full length.
Correct answer: B) 0.7 L/r